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Production of S = -2 baryonic states

large p stop rate on a 3 He target. n. K *-. p. n. p. K *+. p. K 0. Y. Y. Ξ -. p. Ξ -. K *-. H. p. Production of S = -2 baryonic states. via (K * , K) using stopped p. e.g. :. p p → K *- K *+. S= - 2 states. step 1 :. step 2 :. K *- n → Ξ - K 0. n p. p.

ray-ramsey
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Production of S = -2 baryonic states

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  1. large p stop rate on a 3He target n K*- p n p K*+ p K0 Y Y Ξ- p Ξ- K*- H p Production of S = -2 baryonic states via (K*, K) using stopped p e.g. : p p → K*- K*+ S= - 2 states step 1 : step 2 : K*- n → Ξ- K0 n p p low relative energy very low recoil on Ξ- ( recoil free kinematics ) 3He

  2. p d → Ξ- Ks0 K*+ Production of S = -2 baryonic states Ξ- production detector multiplicity of charged particles primary reaction (step 1 + step 2 ) PM target gas supply straw tracker mini target cell 2 Ks0π+ delayed decays cτ = 4.9 cm cτ = 2.7 cm π+π- ~2m π+π- p Λπ- cτ = 7.9 cm 8 final state p π- → reaction trigger = multiplicity increase segmented start scintillator outer scintillator 3 layer “quirl” structure geometry → event reconstruction

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